Male erectile dysfunction is treated with purple viagra pill. Sildenafil, a component in the medication, gives men a stronger feeling during sexual activity. Only guys who are at least eighteen years old should use this medication. Men with erectile dysfunction are treated with this medication. Follow your doctor's advice when taking this medication. Consume this medication with water; do not crush or chew the tablet. This medication takes four to six hours to take effect. This medication can be used either before or after a meal.